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Can no longer see NAS icon in Network Folder - Can not read or write files

Question

A few days ago on my main PC, the NAS (server name) icon dissappeared from the windows network folder, and I can no longer read or write access files on the NAS.

I connect via a Huawei 3G wireless router.

It was working OK before and I have not changed anything.

Have tried the \\servername\folder method, and also the IP address method and all fail saying "windows can not access
\\[serverename]\[foldername]"

The NAS does not show up when I try to map a network drive. The following troubleshooting has been done...

1. On this PC, I can see other PCs on the network and DO show the icon for those, but can not connect to them with the same error.
2. If I connect my laptop, wired or wireless through the router it can access the NAS and read/write as normal. The NAS shows in the network folder as normal.
3. On the problem PC, I can see the domain for the NAS in my network folder, and I can access the NAS to log in for settings etc.
4. I thought it might be the ethernet port hardware fault on the PC, but I can see other computers on the network and surf the net.
5. I have swapped network cables and ports on the router with different ones but still the problem persists with my main PC.
5. I can ping to the NAS using the IP address set up as virtual server in the router.
6. I have uninstalled Norton internet security and still have the problem. Currently no 3rd party securioty or antivirus is installed. Still a problem
7. Windows network troubleshooter fails...I get the foillowing:-

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